Make PlatformFileForTransit a class on Windows.

remoting/host/desktop_session_proxy.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/host/desktop_session_proxy.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 203 matching lines @@
   DCHECK(!desktop_process_.IsValid());
 
   // Ignore the attach notification if the client session has been disconnected
   // already.
   if (!client_session_control_.get())
     return false;
 
   desktop_process_ = std::move(desktop_process);
 
 #if defined(OS_WIN)
-  // On Windows: |desktop_process| is a valid handle, but |desktop_pipe| needs
-  // to be duplicated from the desktop process.
-  HANDLE temp_handle;
-  if (!DuplicateHandle(desktop_process_.Handle(), desktop_pipe,
-                       GetCurrentProcess(), &temp_handle, 0,
-                       FALSE, DUPLICATE_SAME_ACCESS)) {
-    PLOG(ERROR) << "Failed to duplicate the desktop-to-network pipe handle";
-
-    desktop_process_.Close();
-    return false;
-  }
-  base::win::ScopedHandle pipe(temp_handle);
-
+  base::win::ScopedHandle pipe(desktop_pipe.GetHandle());
   IPC::ChannelHandle desktop_channel_handle(pipe.Get());
-
 #elif defined(OS_POSIX)
   // On posix: |desktop_pipe| is a valid file descriptor.
   DCHECK(desktop_pipe.auto_close);
 
   IPC::ChannelHandle desktop_channel_handle(std::string(), desktop_pipe);
-
 #else
 #error Unsupported platform.
 #endif
 
   // Connect to the desktop process.
   desktop_channel_ = IPC::ChannelProxy::Create(desktop_channel_handle,
                                                IPC::Channel::MODE_CLIENT, this,
                                                io_task_runner_.get());
 
   // Pass ID of the client (which is authenticated at this point) to the desktop
@@ skipping 285 matching lines @@
 }
 
 // static
 void DesktopSessionProxyTraits::Destruct(
     const DesktopSessionProxy* desktop_session_proxy) {
   desktop_session_proxy->caller_task_runner_->DeleteSoon(FROM_HERE,
                                                          desktop_session_proxy);
 }
 
 }  // namespace remoting